18256763840 has 112 divisors (see below), whose sum is σ = 50001903552. Its totient is φ = 6219472896.

The previous prime is 18256763831. The next prime is 18256763851. The reversal of 18256763840 is 4836765281.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325724 + ... + 377636.

Almost surely, 2^18256763840 is an apocalyptic number.

18256763840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18256763840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25000951776).

18256763840 is an abundant number, since it is smaller than the sum of its proper divisors (31745139712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18256763840 is a wasteful number, since it uses less digits than its factorization.

18256763840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52094 (or 52084 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 18256763840 in words is "eighteen billion, two hundred fifty-six million, seven hundred sixty-three thousand, eight hundred forty".